Need to find out what part this is
#2
This is the PCV valve or sometimes called the Jet Suction pump / purge valve. These commonly get clogged or cracked and cause leaks. For a 2005 A4 1.8t the part number you need is 058133753B.
https://www.wolfautoparts.com/catalo.../?q=058133753B
https://www.wolfautoparts.com/catalo.../?q=058133753B
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